Kernel memory disclosure via uninitialized io_uring pointer
Published May 2, 2022 · Updated Aug 3, 2024
Information disclosure in the Linux kernel through 5.17.5 allows local users to expose sensitive kernel memory through io_uring I/O polling. In fs/io_uring.c, io_rw_init_file leaves kiocb->private uninitialized, and iocb_bio_iopoll later reads the stale pointer value. The published proof of concept requires an affected kernel, a readable /dev/sr0 device, and either disabled SMAP and SMEP or a KASLR leak.
Summary
What happened
Information disclosure in the Linux kernel through 5.17.5 allows local users to expose sensitive kernel memory through io_uring I/O polling. In fs/io_uring.c, io_rw_init_file leaves kiocb->private uninitialized, and iocb_bio_iopoll later reads the stale pointer value. The published proof of concept requires an affected kernel, a readable /dev/sr0 device, and either disabled SMAP and SMEP or a KASLR leak.
The record
- CVE
- CVE-2022-29968
- Published
- May 2, 2022
- Updated
- Aug 3, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 2, 2022CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
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Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
No sourced classifications are available.
Public exploit references
- CVE-2022-29968 io_uring proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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